Retry issue after migration to 13.5

Hi

We use feign-java11 and feign-gson dependencies in our project and after we migrated from 13.1 to 13.5 one of our tests started failing.
This test uses WireMock and verifies that if malformed response is sent to the client then RetryableException is thrown.

extension.stubFor(post(urlEqualTo("/cities")).willReturn(aResponse().withFault(Fault.MALFORMED_RESPONSE_CHUNK)));
assertThrows(RetryableException.class, () -> cityClient.create(city));

In 13.1 this test passed but in 13.5 fails. Our investigation shown that in both Feign versions IOException is thrown but in 13.1 it's correctly caught in SynchronousMethodHandler.executeAndDecode:

java.io.IOException: chunked transfer encoding, state: READING_LENGTH

And in 13.5 it's not caught. The last line that was executed is

cf = sendAsync(req, responseHandler, null, null);

in HttpClientImpl.send

Start with SynchronousMethodHandler.executeAndDecode and HttpClientImpl.send, then compare the IOException handling between Feign 13.1 and 13.5. Reproduce the WireMock MALFORMED_RESPONSE_CHUNK case from the issue and verify that the client again throws RetryableException as expected.